Governor for electric-lighting generators for motor-cars.



H. C. H. SMYTH.

GOVERNOR FORELETRIC LIGHTING GENERATORS FOR MOTOR CARS. APPLICATION HLED091.26. 191 5.

1 21 3,702. Patented Jam 23, 1917.

'B F B2- Witnesses HERBERT CHARLES HUMPHREY SMYTH, OF LONDON, ENGLAND,

GOVEBINOR FOR ELECTRICPLIGHTING GENERATORS FOR MO 'Ill'OIl3.-(L.\.RS

To all whom it may concern:

Be it known that I, HERBERT CHARLES HUMPHREY 'SMYTH, a subject of theKing of 'England, residing at London, in the Kingdom of England, haveinvented anew and useful Governor for Electric-Lighting Generators forMotor-Cars, of which the' following is a specification.

' In motorcar lighting apparatus, the varying speeds of the car affectthe output of the generating dynamo, and it is usual to provide meansfor controlling the output by opening or closing. extra. circuitsthrough which current can flow, and also by openmg and closing theexternal circuit of the (iyniuno at predetermined speeds of .thearmature.

, It is the object of this invention to provide a centrifugal governorcapable of be ing regulated, during working, for any speed andconsisting of a single weighted lever arm pivoted to a support on thearmature shaft and acting on a co-axial pin whichslides in a stationarysupport in contact with multiplied leverage under adjustablespringcontrol for the purpose of making or breaking an electric circuit.

My invention is shown in the accompanying drawings, in which 2-.-

Figure 1 a side elevation, partly in section, of the device with theregulating spring omitted for the sake of clearness; Fig. 2 an end viewof the statlonary support for car ,rying the regulating spring andelectrical contacts;,Fig. 3, a diagram showing the positions of theelectrical contact blocks arranged for breaking the electrical circuitat predetermined speed.

The regulating device is of the centrifugal type, that is to say it isoperated by a weighted centrifugal lever W pivotally secured at H to asupport D which is fixed to the armature shaft A of the generatingdynamo; the end of the lever W, when subjected to centrifugal force,acts against a sliding pin or plunger which in turn presses against alever L The pin or plunger P is mounted in an' aperture in a stationary.support or plate F which also carries the said lever L and other partsof the device. The lever Ifl'is pivoted at l-Pradially' toward the pin Pand engages a lever L near the pivot H. This le, er L is diametrically-vSpecification of Letters Patent.

Patented Jan. 23, 1917.

Application filed October 26, 1915. Serial No. 58,078.

pivoted at H and is fitted with a pin E i which carries the contactblock B which latter may be so disposed as to normally rest in contactwith the stationary contact blocks B and B The said levers L and L arekept pressed against the pin or plunger P by means ofa coiled spring O,see Fig. 2, which with'the end 0 engages the lever L and with the otherend 0 is fixed to the spindle Q, on which the spring is coiled.

The action of turning thesquared end Q? of the spindle Q, in the onedirection or the other will either increase,.or decrease, the tension ofthe spring, said spindle being locked by a screyv S. It will be evidentthat when the weighted lever .W is under centrifugal force, it pressesagainst the pin P and by means of the multiplied leverage will shift thecontact block B and so break the electrical contact with the blocks Band B .The multiplied leverage is provided so as to which'is subjectedto centrifugal force, is the weighted lever V. The regulating spring 0does not move or revolve and therefore can be adjusted while the dynamois in operation and as it is not attached/co the shaft A, it is notaffected by the heat generated in the armature.

The foregoing description refers to the arrangement of contact blocks B,B and B when the device is required to break electrical contact at anypredetermined speed of the armature shaft, but it will be clear from thealternative arrangement shown in Fig. l that when the contact block B isnormally held apart from B and B, the device will serve. to'makeelectrical contact when the predetermined speed is attained. It is to benaturally understood in both cases that the stationary blocks B and Bare insulated and form part of an electrical circuit.

I claim:

1. A centrifugal governor for electrical generators comprising acentrifugal lever rotating with the dynamo-shaft and separatecontact-operating mechanism carried on is that the only part of thismechanism anadjacent stationary supporting plate within the generator,said mechanism consisting of a sliding pin co-axial with the pin,

ary supporting plate, a radially disposed le-' .ver pivotallymounted onthe latter and controlled at its free end by the said sliding a contactlever pix oted diametrically opposite the radial lever and controlledthereby at its free end, a fulcrum-pin fast Jon the contact lever; anelectric contact block seated on said fulcrum-pin, a pair-of contactblocks fast on the stationary support within the path of the fulcrumedcontact A block, and means for keeping the contactoperating mechanism inconstant cooperation with the said centrifugal lever, as described.

QQHI a centrifugal governor for electri cal generators which comprises-asingle Weighted centrifugal lever carried by the dynamo shaft andseparate pin operated multiplying lever mechanism on a stationarysupport for electrical contacts, the combination with said multiplyingmechanism

